Grease pump



c. F. GODDARD GREASE PUMP ori inal Filed Feb. 4. 1926 anaemic;

mamas f. mam/m 5 Sheets-Sheet 1 Jan. 8, 1929.

C. F. GODDARD GREASE PUMP Original Filed Feb. 1926 5 Sheets-Sheet 2 Whoa CHARLES GUDDARD Jan. 8, 1929.

1,698,159 c. F. GODDARD GREASE PUMP Original Filed Feb. 4, 1926 s Sheets-Sheet 3 anveutoa;

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1m m no Patented Jan. 8, 1929.

UNITED STATES PATENT oF FICE.

CHARLES F. GODDARD, OF DENVER, COLORADO, ASSIGNOR TO GODDARD SPECIALTIES COMPANY, INCORPORATED, A CORPORATION OF COLORADO. I

GREASE your.

Application filed February 4, 192e, SerialNo. 85,953. Renewed November 14, me.

My invention, in its broad aspect, has reference to improvements in grease pumps of the pneumatic type for use in pumping stifl' grease under very high pressure for the lubrication of automobile or other bearings; and more particularly it is my-purpose to attain by novel mechanism and a unique construction and arrangement of parts not only the expulsion of stiff grease under very big pressure, but the return of the pump piston to its position for commencing another power stroke by the pressure of the rease or fluid to be pumped thereby provi ing for automatic andcontinuous operation of my pump as long as the supply of grease holds out, and that without the use of cam devices, gears,

or other complicated timing or control mech-- amsm.

My invention contemplates broadly the utilization of a sealed container foriholding grease, or other fluid to be pumped, under moderate pressure, and a single acting cylinder to receive the said grease or other fluid and eject it at a much higher pressure. In the grease container I provide a follower to evenly distribute pressure upon the body of grease, and the pumping cylinder is formed 1 with a relativel large compression chamber inwhich a head signed to travel. The head is formed with a much greater. diameter than the diameter of the iston with theresult that for a given num er of pounds of air or fluid pressure per square inch upon the head, a relatively greater pressure per square inch of pumping surface will be exerted by the piston upon the body of grease to be expel ed. Automatic valve apparatus controlled b the stroke of the iston is provided for in ucing simultaneous y substantially the same air pressure upon the follower in the grease con-' tainer and upon the head of the piston in the compression chamber, and then at the termination of a power stroke exhausting the compression chamber without cutting off the supply of compressed air or fluid to the grease container thereby causing the piston to be automatically returned by the pressure of the grease or other fluid in the system toits normal position for another power stroke, at which time the valve apparatus is actuated to again admit compressed air or fluid to the compression chamber; the exhaust port from the compression chamber being closed.

. fined for the carried by the piston is dereference are use der 'der by agradually reduced portion, 91; invert-v Other important objects and advanta es of my pump may be briefly defined as 01- lows; first, I provide a valve structure which exerted by the piston. per poundageof air or fluid pressure in the compression chamber.-

While I have in the present instance desake of illustration aspecific form of my pump device it will be understood that I do not desire to limit myself except as may be indicated by the scope of the claims appended hereunto and forming a part of this specification.

In the drawings wherein is illustratedan embodiment of my invention;- Figure 1 is a sectional side-elevation of my apparatus,

Flgure 2 is a view taken on the line 22- 2 of Flgure 1,

Figure 3 is a my valve members, the sprlng being omitted, and alsoshows a portion of the supporting structure for the same, A

' Figure 4: is a top plan view of one of the valve heads,

Figure 5 is an enlarged end view offa -por-- tion of my valve structure, and 1 Figurefi is a detail VlBW 'Of the top portion of my grease container and the hingedv cap perspective view of one ofbe cast and machined at relatherefore; the retaining being shown in detail.

'. In the drawings d to designate like or similar parts throughout the several views;--

' The numeral (1) designates my grease container which may be cylindrical, rectangular or any other suitable shape, and (2) the compump cylinder of the same bem desi atedd is of greater diameter than the pump cylina :PIGSSIOII chamber of my pump element, the

(3).. The compression cham er (2 nine (3) andis connected to the pump cylinwherein like characters of."

ed oonical web portion (4). The chamber web. :(4 and cylinder (3) are cast in a umt'which 13 attached to the grease containis a hollow or (1). The web or reduced portion (4) has a thickened wall 5) adjacent the. cylinder 3 which is provi ed with an annular recess- 6 for receiving packiag held in place by a anged packing gland The gland (7) is maintained in ition by screws, as shown at (8) engaging in the portion (5), and through said glandand extending intothe cylinder iston (9), thelower end of which is closed y a plug (10). The upper end of the piston is reduced as at (11) to form aseat for the head. (12) which is of approximatel the same diameter as the compression chain r (2), and has a face plate (13) between which and the head is a packing element (14). The plate'(13) and packin element, together with the head (12) are h ld in place by a nut (15) to form a rigid assembly. Arranged to close the upper end of the com pression chamber (2) is a cap (16) formed cated to form arms (22 rotatably en aging upon the seats (16) and 1 upon occasion with passages (19) an respectively.

ports (28) adapted to re ister,

provided wit e shaft (21) has a head formed on its lower end for en agement with the flange (30 surrounding t e opening 1n the piston hea nut (15) so that when the piston (9) reaches approximately its downward limit of movement (completion of its stroke) the shaft is pulled down to rotate thevalves (27). The pins (25) are slidable in the sleeves 26) to compensate for the movement of the s aft, and springs (30). are provided thereonto hold them normally extended as shown in Figure 1.

The passage (19) communicates with a chamber (31) into which is tapped a compressed air or fluid intake assage (32) connected with an air or fluid compressor (not shown), and also communicating with the chamber (31) is a port (33) near the top of the rease container (1) lngedly mounted as at (34) on the cap 16) is a cover plate*('35) for the container 1), same being normally held in place thereon bya bail (36) and screw (37 and within the container (1) is a follower plate (38) v havin a handle (39) and designed to evenly distri ute pressure upon the body of grease therein. ,To remove the'cover-plate the screw (37 is loosened and the bail (36) swung down. a p

Formed in the bottom of the grease 'contain-' er (1) is a. port (40) which communicates with a passage (41) which in turn communicates with a substantially semi-spherical chamber (42) in the base of the pump cylin-- der (3). Retained in the chamber (42) is a ball (43) which is spring seated, as at (44), to normally close the passage (41), and said chamber (42) has tapped therein a nipple (45) which is adapted t'o'receive a grease discharge pipe (not shown) which should preferab y be provided with a cut-off valve to control the distribution of grease to the bearings of a motor vehicle or the like.

In operation, the valves are set as in Figure 1 at the beginning of a power stroke,

the passage (19) being open. and the passage (20) closed. The grease container (1)- is filled with still grease or other fluid to be pumpedgthe cover plate (35) being first remove by backing the retaining screw (37) to release the bail (36), and the follower plate (38) is withdrawn. The follower plate and cap are then replaced and air or other fluid is admitted under ressure through the passages (33 and (19 to the grease container above-t e follower plate, and to the compression cylinder (2)- above the head (12). Pressure of the air on the follower (38) forces the rease contained in the container (1') throng the port (40), and passage (41) past the ball check valve the piston (9) The pressure of air admitted through the passage (19) pressin onthe head (12) forces theIpiston' (9) own discharging the grease contained in thepum cylinder (3) and chamber (42) throu-g nipple (45) to the grease discharge pipe (not shown). When the piston (9) reaches the lower'end of its travel the shaftf(21) is'pulled down, actuating the valves (27) to close ptassage (19) and openv the passage (20) t ereby permittingthe' air to be discharged from the compressionchamber (2). Whereupon the trapped air (under pressure) in the grease container (1).contin ues to force the follower plate (38) down thereby forcing some of the grease in said container past the valve (43) and against the end of the piston (9) with the result that the pistoo .(43) and into the pump cylinder (3) below 7 ton is pushed upward to its initial position 120 thereby moving the valves to close'passage (20 and again open passage (19) t0 start another stroke. This cycle of operation is repeated until the body of grease in container (1) is exhausted with a consequentgreat saving in time andlabor over certain grease pumps now on the-market.

While in the foregoing, there has been illustrated in the drawings and described in the specification such combination and arrangement of, elements'as constitute the preferred embodiments of iny invention, it

is nevertheless desired to emphasize the fact that interpretation of the invent'ion'should only be conclusive when made in the light of the subjoined claims.

I claim '1. In adevice of the type described,-"the combinati6n ofa pumping unit having a vent, and" a container for substance to be pumped, a source of fluid pressure supply in constant communication with the container to normally urge the contents from said container, said pump unit having a confnection withsaid container for receiving the substance discharged. therefrom, said pump unit also having a connection with the source of fluid supply, a valve device as sociated with the pump unit and movable thereby to open the pump vent and close the fluid pressure supply at the termination of its dischar e stroke, and close the pump vent and open}; e fluid pressure supply when the pump is in position for its power stroke, and

a check valve in the connection between the nd'influenced by prescontainer and 1) sure of substance in the container'to open the connection between the container and pump unit at the endof the power stroke of the pump unit, and close the connection between the container and pump unit at the 'the pump unit and movable thereby to open the ump vent and close the fluid pressure supp l wit the connection between the container and pump and influenced by pressure of substance in the container to open the connection between the containerv and end of the ower stroke 0 tainer and pump-unit at the beginning of the power stroke of the pumpi- 3. In a device of the'typedescribed, the 1 combination of a pumping unit having a compression and a pumping chamber, and a doule headed piston operable in saidchambers, and a container for substance to be pumped, a source of fluid pressure supply in constant communication with the container to nory at the termination of its discharge or power stroke, and close the pump vent and open the fluid pressure supply when the pump is in position for its power stroke, and a spring pressed ball check valve associated" pumpunit atthe 'the' pump unit,- and close t e connection between the con-' mally urgethe contentsfrom said container, 1 the pumping chamber of the pump unit havin -a connection with said container for receiving the substance discharged therefrom,

thecompres sion chamber of the pump unit having a connection with the source of fluid supply and provided 'with a vent, a valve device associated with the pump unit and movable with the piston to open the .vent and close the fluid pressure sup ly at the termination of the discharge stro lie of the and close,the vent and open the flui pressure'supplywhen the for its ppwer stroke, an a check valve associated with the connection between the container and pumping chamberand influenced by pressure of substance in thecontainer to piston is'- in position I open connection between the container and pump unit at the end of the power'stroke of the piston, and close the connection between the container and ump unit at the beginning ofthe power stro e of the piston.

4. In a device of the type described, the I combination of a pumping unit havin a comression and a pumping chamber, an a doule headed differential piston operable in said chambers, and a container for substance to be pumped, a source of fluid pressure supply in constant communication with the contamer to normally urge the contents from said container, the pumping chamber of the pump unit having a connection with said con-i tainer for receiving the substance discharged therefrom, the compression chamber of the pump unit having a connection with the source of fluid supply and provided with a vent, a valve deviceconnected with the piston and movable thereby-to open the vent and close the fluid termination of the arge stroke of the piston, and close the vent and open the fluid pressure supply when the piston is in osipressure supply at the\ tion for its. power stroke, and a ball 0 eck,

valve associated with the connection between the container and pumping chamberandin-f' fluenced by pressure of substance in the container to open the connection between the-container and pump unit at the end of the power stroke of t e pump unit, and close the connection between the container and pump unit- 'at the beginning of the power stroke of the pump, said valve being normally spring seated in its closin position.

5. In a device'o the'typei'describem'the 2 combination of a pumping unit having a vent, and a container for substance to be pumped, a source of fluid pressure supply in constant communication with the container to normally urge the contents from saidcon tainer, said pump unit having a connection with said container for receiving the substance discharged therefrom, said pump unit v also having a connection with the source 'of fluid supply, a valve unit associated with tithe pump unit and having a pair of simuliston,

taneousl operable valve devices movable respective y to open the pump vent and close the fluid pressure supply at the termination of the discharge stroke of the pump, and

6 close the pump vent and open the fluid pressure supply when the pump is in position for its power stroke, and a check valve in the connection between the container and pump and influenced by pressure of subhereunto. I

' CHARLES F. GODDARD. 

